205324421 has 2 divisors, whose sum is σ = 205324422. Its totient is φ = 205324420.

The previous prime is 205324391. The next prime is 205324463. The reversal of 205324421 is 124423502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129390625 + 75933796 = 11375^2 + 8714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205324421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205324481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102662210 + 102662211.

It is an arithmetic number, because the mean of its divisors is an integer number (102662211).

Almost surely, 2^205324421 is an apocalyptic number.

It is an amenable number.

205324421 is a deficient number, since it is larger than the sum of its proper divisors (1).

205324421 is an equidigital number, since it uses as much as digits as its factorization.

205324421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 205324421 is about 14329.1458573078. The cubic root of 205324421 is about 589.9477316523.

Adding to 205324421 its reverse (124423502), we get a palindrome (329747923).

The spelling of 205324421 in words is "two hundred five million, three hundred twenty-four thousand, four hundred twenty-one".